Resawing-machine



C, B. SPRAGUE. RESAWING MACHINE. APPLICATION man JUNE n. 1918.

1,344,096. Patnted June 22, 1920.

3 $HEETS-SHEET I.

By W M MW C. B. SPRAGUE.

RESAWING MACHINE.

APPLICATION FILED iUNE n, 1918.

1 344,096 Patented J 1111022, 1920.

3 SHEETSSHEET 2.

CHARLES B.

To all cohom it may concern umrrn s ATe'sf P NT. omcs.

SPRAG'O'E, OF MINNEAPOLIS,MINNESOTA, ASSIGNO WORKS, 013 mmnmmomsmmnnsom,A CORPORATION.

BEQSEAWING-MAQHVINE.

7 Application iiled lune 11,

Be it known that I, CHARLns B. SPRAGUE, a citizen of the United States,residing at Minneapolis, in the county of Hennepin and State ofMinnesota, have invented certain new and useful Improvements inResawing- Machines, of which the following is a specification. I 2

My invention relates to a 'rc-sawing machine and the object is toprovide a machine of this character which can be quickly and easily setfor cutting various thicknesses of lumber from slabs, cants and boardsas they come to-the machine, -The object more specifically stated is 'toprovide a machine in which the sawing mechanism can be raised by fluidpressure to provide for adjustments for the various thicknesses of cut.2

The full objects and advantages of my invention willappearinconnectionwith the detailed description thereof and are particularly pointed outin the claims.

Referring to thedrawings, Figure 1 is a {front sectionalelevation. Fig.2 is a vertical section taken at right angles to Fig. 1.

i Fi 3 is a horizontal section on line 33 1O designates the-base of themachine, which is secured by bolts 12 to a suitable supporting structureor framework 14.

Bolted to the base are a pair of standards 16 and 18 to the upper endsof which is secured a plate 20 which serves as a support for the upperstretch of an endless feeding belt consistingof slats 22 which travelover wheels 24 and 26. These wheels are secured to shafts 28 and 30respectively, mountedin i journals in brackets 33 and 35 which aresecured to the standards 16 and 18. Secured to the shaft 30 is asprocketwheel 32 V which is driven by a sprocket chain 34. v

Mounted on theframework 14 is a cylinder 36within which is a piston v38secured to the'lower end of a piston rod 40 which extends .upwardlythrough a gland 42. To

' the upper end of the piston rod is secured asliding guide 44 engagingwith} a fixed.

guide 46 secured to the framework. A connecting rod 48 is pivotallyattached to the sliding guide and the other end of the connecting rod ispivoted to an arm 50 secured to a rock shaft 52 journaled in brackets 54which depend from the base 10. Also secured to the rock shaft are twosimilar arms are plates 84 which constitute a or for the usual overheadfeeding device 86 Specification of Letters ratent. Pat t d J e 22 19201918. s mi no. 239,356.

56 to which'are pivoted links 58 the other ends of which are pivoted toa sliding frame which embodies two end members 60 shaped to slide indove-tailed channels in the inner sides of the standards 16 and 18, asbest shown in Fig. 3, and a cross beam 62 having ,a dependent lug 64 fora purpose which will presently appear. Secured to the sliding members 60and extending between them are a pair of horizontal beams 66 and 68 uponwhich are journals for shafts 70 and I 72. Secured to these shafts arewheels 74 having press rolls 88 and feeding chains 90, the latter beingdriven in the usual way by a belt 92 running over a pulley 94. r

The sliding frame is raised by admitting steam or compressed air intothe cylinder through the inlet pipe 96 and the admission port 98. Anoutlet pipe 100 and exhaust port 102 are provided for the escape ofsteam or compressed air. The two ports are controlled by a sliding valve104 which is of slightly greater length than the distance between thetwo ports, so that it may entirely cover both of them when desired. Thevalve 104 is attached to a rod 106 and is normally held down in achamber 108 by a spring 110. The upper end of the rod is pivotallyconnected to a lever 112 which is end of the bell-crank is extended toform a handle 122 which cooperates with a notched segment 124 in theusualmanner. Upon moving the handle 122 forwardly the valve 104 will belifted and steam or compressed air admitted at the bottom ofthe cylinderto raise the piston, thereby lifting thesliding frame which carries theband-saw 78 and the overhead feeding device 86. The cylinder is providedwith an air outlet opening 126 toward its u per end. When the piston ismoved over tiiis opening, the air in the upper part of the cylinder isimprisoned and an air cushion formed to check the upward movement of thepiston. When the R '10 DIAMOND mo! pivotedat 114 to the framework. Theother end of the lever is pivotally connected to a 2 ,ww e,

ent lug 6 1 previously referred .to. Arranged for cooperation with thislug is a stepped slide 128 which maybe moved under the lug in order tobring the particus ment by the lug when the sliding frame descends. Theslide 128 is operated by means of a link 130 which connects it to abellcrank 132 pivotedtothe base. 'The other end of the bell-crank' ispivotally attached to a connecting rod 134, the upper end of which ispivoted to a lever 136. The upper end of this lever is extended to forma handle 138 which cooperates with a notched segment 1 10 in the usualway. By operating the handle 138 a particular step of the slide 128corresponding to the desired thickness of the piece to be cut from thebottom of a slab 140 is positioned under thelug 64:. After this hasbeendone, the valve 104i is lowered to permit the steam or compressed air toescape from the exhaust port 102 and c the sliding frame descends bygravity to the predetermined position. The descent of the frame may beregulated by manipulation of the handle 122 so as to either uncover onlya portion of the exhaust port or so as to alternately'uncover and closethis port.

The operation and advantages of my invention will be obvious from theforegoing description. Various thicknesses of lumber as desired maybecut from slabs or timbers.

The proper adjustment is easily and quickly made by simple manlpulationof levers Wlbllin easy reach of the operator. The sliding frame carryingthe band-saw and the overhead feed is lifted by steam or compressed airpower to a height sufficient to permit of any desired adjustment and theframe descends by its own weight to the selected position.

claim: 1. A re-sawing machine comprising a horizontal band-saw, meansfor lifting said saw by fluid pressure, and means for selecti lntrolling the position to which said saw is permitted to descendwhen thefluid pressure is relieved.

2. A ire-sawing machine comprising a horizontal band-saw, a slidingframe on which said saw is supported, means for lifting said frame toits full height by fluid pressure, and means for selectively controllingthe position to which said frame is permitted to descend when the fluidpressure is relieved. 1

3.'A re-sawing machine comprising a horizontal band-saw, a sliding frameon which said saw is supported, means for 'bring any one of its stepsinto position for lar step desired into position for engageengagement bysaid stop upon descent of SitlCl' frame.

4'. A re-sawing" machine comprising a horizontal band-saw, a slidingframe on which said saw is supported, means for lift-.

ing said frame to its full height by fluid pressure, a stop on saidframe, a stepped slide, a lever within easy reach of the operator, andconnections between said lever and said slide whereby any one of thesteps of the latter may be brought into position for i hi easy reachofthe operator, means controlled by one of said levers for lifting saidframe by fluid pressure, and means op erated by the other of saidleversfor selectively controlling the position to which said frame ispermitted to descend when the fluid pressure is relieved. p

6. A re-sawing machine comprisin a base, standards rising from saidbase, a bottom feeding device mounted on said standards, the latterbeingprovided with vertical slide ways, a sliding frame having membersfor sliding in said slide ways, a horizontal band-saw mounted on saidframe, an

overhead feeding device on said frame, means for lifting said frame byfluid pressure, and means for selectively controlling the position towhich said frame is permit ted to descend when the fluid pressure isrelieved.

7. A re-sawing machine. comprising a base," standards rising from saidbase, said standards beingprovided with vertical'slideways, a slidingframe havingmembers for Slldlllg in sa d slide-ways, a horizontal bandsaw mounted on said frame, two levers within easy reach of the operator,means controlled by one of said levers for lifting said frame by fluidpressure, a stop on said frame, a stepped slide, and connections betweenthe other one of said levers and said slide whereby anyone of thesteps of the latter may be brought into position for engage ment by saidstop upon descent of said frame when the fluid pressure is released.

In testimony whereof I hereunto ailix my CHARLES B. SPRAGUE.

signature.

